For any circle with Cartesian equation

,
we have that the centre of the circle is

, and the radius of the circle is

.
So in the case that

,
we essentially have that

.
So the centre of the circle is

, and the radius is

.
p is 9
<u>Step-by-step explanation:</u>
Step 1:
Given 77 = 8p + 5. Find p
⇒ 8p + 5 = 77
⇒ 8p = 72
⇒ p = 72/8 = 9
Answer:
maby c
Step-by-step explanation:
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9514 1404 393
Answer:
B. 15
Step-by-step explanation:
From the second equation, ...
b² = 17² -8²
b = √(289 -64) = √225
b = 15